package Test;

import java.io.*;
import java.util.HashMap;
import java.util.Map;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * Created by w on 2017/12/21.
 */
public class Test04 {
    public static void main(String[] args) {
        Map<String, Integer> map = new HashMap<>();
        BufferedReader reader = null;
        try {

            reader = new BufferedReader(new FileReader("D:\\key.txt"));

            String stuNo = null;
            while ((stuNo = reader.readLine()) != null) {
                map.put(stuNo, 0);
            }
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                reader.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        File file = new File("D:\\16信本2班Java作业一");
        File[] files = file.listFiles();
        for (File f : files) {
            String fileName = f.getName();
            String no = null;

            Matcher matcher = Pattern.compile("信本2班(\\d+)")
                    .matcher(fileName);
            while (matcher.find()) {
                no = matcher.group(1);
            }
            map.put(no, 1);
        }
        for (Map.Entry<String, Integer> entry : map.entrySet()) {
            if (entry.getValue() == 0) {
                System.out.println(entry.getKey());
            }
        }
    }
}
